How Things Spread - 1 May

Sophie Scott: Why Is Laughter Contagious?
Seth Godin: What Makes An Idea Go Viral?
Bill Gates: How Can We Prevent The Next Global Health Epidemic?
Nicholas Christakis: How Do Our Social Networks Affect Our Health?
Yuval Harari: Why Did Humans Become The Most Successful Species On Earth?From NPR’s TED Radio Hour